Public bug reported:

If I boot up my laptop with the wireless disabled, then enable it once
the machine has booted, I can not see any APs or use the wireless unless
I restart. Even if the wireless is enabled, it is a gamble as to whether
not wireless will work. It seems to be very random as to whether or not
it will decide to connect or not. At times it will see all available APs
and try and connect, but then always popup with the password dialog box
for the AP and regardless of what password you enter (correct or
incorrect), it will never connect.

I have tried the instructions from this bug report [
https://bugs.launchpad.net/ubuntu/precise/+source/bcmwl/+bug/1002703 ]
but still having the same issues.

( sudo apt-get remove bcmwl-kernel-source
sudo apt-get purge bcmwl-kernel-source
sudo apt-get install linux-firmware-nonfree ) 

My machine is a Dell Vostro 1540 with a Broadcom Corporation BCM4313
802.11b/g/n Wireless LAN Controller (rev 01)

Here seems to be the relevant issue form dmesg:

[   86.282492] ------------[ cut here ]------------
[   86.282521] WARNING: at /build/buildd/linux-3.2.0/net/mac80211/rx.c:2985 
ieee80211_rx+0x12b/0x180 [mac80211]()
[   86.282524] Hardware name: Vostro 1540
[   86.282526] Modules linked in: pci_stub vboxpci(O) vboxnetadp(O) 
vboxnetflt(O) joydev vboxdrv(O) dm_crypt parport_pc rfcomm bnep ppdev 
binfmt_misc snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_intel snd_hda_codec 
bcma snd_hwdep snd_pcm psmouse snd_seq_midi snd_rawmidi snd_seq_midi_event arc4 
snd_seq snd_timer snd_seq_device brcmsmac mac80211 brcmutil cfg80211 mei(C) 
dell_wmi dell_laptop dcdbas serio_raw lp uvcvideo snd videodev crc8 cordic 
btusb bluetooth mac_hid sparse_keymap intel_ips soundcore snd_page_alloc 
parport ums_realtek uas usb_storage wmi i915 r8169 drm_kms_helper drm 
i2c_algo_bit video
[   86.282580] Pid: 0, comm: swapper/3 Tainted: G        WC O 
3.2.0-26-generic-pae #41-Ubuntu
[   86.282583] Call Trace:
[   86.282589]  [<c158f6ca>] ? printk+0x2d/0x2f
[   86.282596]  [<c105a682>] warn_slowpath_common+0x72/0xa0
[   86.282618]  [<f918c9eb>] ? ieee80211_rx+0x12b/0x180 [mac80211]
[   86.282630]  [<f918c9eb>] ? ieee80211_rx+0x12b/0x180 [mac80211]
[   86.282632]  [<c10612c0>] ? local_bh_enable_ip+0x90/0x90
[   86.282635]  [<c105a6d2>] warn_slowpath_null+0x22/0x30
[   86.282646]  [<f918c9eb>] ieee80211_rx+0x12b/0x180 [mac80211]
[   86.282648]  [<c149f85e>] ? skb_dequeue+0x4e/0x70
[   86.282657]  [<f916fbf0>] ieee80211_tasklet_handler+0xb0/0x160 [mac80211]
[   86.282663]  [<f92b4fd3>] ? brcms_intrson+0x33/0x40 [brcmsmac]
[   86.282665]  [<c15a5376>] ? _raw_spin_unlock_bh+0x16/0x20
[   86.282667]  [<c10612c0>] ? local_bh_enable_ip+0x90/0x90
[   86.282669]  [<c10612c0>] ? local_bh_enable_ip+0x90/0x90
[   86.282671]  [<c1060de3>] tasklet_action+0x63/0x110
[   86.282673]  [<c10612c0>] ? local_bh_enable_ip+0x90/0x90
[   86.282675]  [<c1061341>] __do_softirq+0x81/0x1a0
[   86.282677]  [<c10612c0>] ? local_bh_enable_ip+0x90/0x90
[   86.282678]  <IRQ>  [<c1061686>] ? irq_exit+0x76/0xa0
[   86.282682]  [<c15acddb>] ? do_IRQ+0x4b/0xc0
[   86.282684]  [<c15acc30>] ? common_interrupt+0x30/0x38
[   86.282687]  [<c105007b>] ? print_cpu+0x25b/0x910
[   86.282689]  [<c1303aea>] ? intel_idle+0xda/0x140
[   86.282691]  [<c147bc1d>] ? cpuidle_idle_call+0xad/0x250
[   86.282694]  [<c10102ec>] ? cpu_idle+0x9c/0xe0
[   86.282696]  [<c158886c>] ? start_secondary+0xe8/0xed
[   86.282698] ---[ end trace 218659c5e77c767b ]---

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-26-generic-pae 3.2.0-26.41
ProcVersionSignature: Ubuntu 3.2.0-26.41-generic-pae 3.2.19
Uname: Linux 3.2.0-26-generic-pae i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu8
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  graeme     3561 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfbf00000 irq 48'
   Mixer name   : 'Intel IbexPeak HDMI'
   Components   : 'HDA:111d76d1,10280526,00100205 
HDA:80862804,80860101,00100000'
   Controls      : 23
   Simple ctrls  : 11
Date: Sun Jul  1 19:24:22 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
MachineType: Dell Inc. Vostro 1540
ProcEnviron:
 LANGUAGE=en_ZA:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_ZA.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-26-generic-pae 
root=UUID=6a853c79-86dc-4f41-9eec-e668f6ea14b4 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.2.0-26-generic-pae N/A
 linux-backports-modules-3.2.0-26-generic-pae  N/A
 linux-firmware                                1.79
SourcePackage: linux
StagingDrivers: mei
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/22/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A01
dmi.board.name: 0NHCFP
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A01
dmi.modalias: 
dmi:bvnDellInc.:bvrA01:bd08/22/2011:svnDellInc.:pnVostro1540:pvrA01:rvnDellInc.:rn0NHCFP:rvrA01:cvnDellInc.:ct8:cvrA01:
dmi.product.name: Vostro 1540
dmi.product.version: A01
dmi.sys.vendor: Dell Inc.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 precise staging

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https://bugs.launchpad.net/bugs/1019837

Title:
  Wireless Connectivity Issue

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